Deprecate serializing PipelineAggregators (backport of #54926) #55025
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`PipelineAggregator`s are only sent across the wire for backwards compatibility with 7.7.0. `PipelineAggregator` needs to continue to implement `NamedWriteable` for backwards compatibility but pipeline aggregations created after 7.7.0 need not implement any of the methods in that interface because we'll never attempt to call them. So this creates implementations in `PipelineAggregator` (the base class) that just throw exceptions.
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PipelineAggregators are only sent across the wire for backwardscompatibility with 7.7.0.
PipelineAggregatorneeds to continue toimplement
NamedWriteablefor backwards compatibility but pipelineaggregations created after 7.7.0 need not implement any of the methods
in that interface because we'll never attempt to call them. So this
creates implementations in
PipelineAggregator(the base class) thatjust throw exceptions.